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Date: Tue, 9 Feb 2010 13:55:49 +0600
Message-ID: <2a7905441002082355w72ec4b2br9b406f186d87c12a@mail.gmail.com>
Subject: index is not using?
From: AI Rumman <rummandba@gmail.com>
To: pgsql-performance@postgresql.org
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--0016368e270d083dbc047f263f5a
Content-Type: text/plain; charset=ISO-8859-1

I have created a index
create index leadaddress_phone_idx on
leadaddress(regexp_replace((phone)::text, '[^0-9]*'::text, ''::text,
'g'::text));

But the index is not using.

explain select * from leadaddress where
regexp_replace(phone,'[^0-9]*','','g') like '%2159438606';
                                               QUERY
PLAN
--------------------------------------------------------------------------------------------------------
 Seq Scan on leadaddress  (cost=100000000.00..100009699.81 rows=1 width=97)
   Filter: (regexp_replace((phone)::text, '[^0-9]*'::text, ''::text,
'g'::text) ~~ '%2159438606'::text)

Could anyone please tell me why? I analyzed the table after index creation.

--0016368e270d083dbc047f263f5a
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

I have created a index<br>create index leadaddress_phone_idx on=A0 leadaddr=
ess(regexp_replace((phone)::text, &#39;[^0-9]*&#39;::text, &#39;&#39;::text=
, &#39;g&#39;::text));<br>=A0<br>But the index is not using.<br>=A0<br>expl=
ain select * from leadaddress where regexp_replace(phone,&#39;[^0-9]*&#39;,=
&#39;&#39;,&#39;g&#39;) like &#39;%2159438606&#39;;<br>
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 QUERY PLAN=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <br>-------=
---------------------------------------------------------------------------=
----------------------<br>=A0Seq Scan on leadaddress=A0 (cost=3D100000000.0=
0..100009699.81 rows=3D1 width=3D97)<br>
=A0=A0 Filter: (regexp_replace((phone)::text, &#39;[^0-9]*&#39;::text, &#39=
;&#39;::text, &#39;g&#39;::text) ~~ &#39;%2159438606&#39;::text)<br>=A0<br>=
Could anyone please tell me why? I analyzed the table after index creation.

--0016368e270d083dbc047f263f5a--